Upgrade readme

Author: SerafimArts

README.md

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-# Rapid Admin Panel Application Skeleton [![Latest Stable Version](https://poser.pugx.org/spiral/app-keeper/version)](https://packagist.org/packages/spiral/app-keeper)
+<p align="center">
+<img src="https://user-images.githubusercontent.com/2461257/112313394-d926c580-8cb8-11eb-84ea-717df4e4d167.png" width="400" alt="Spiral Framework">
+</p>
 
-<img src="https://user-images.githubusercontent.com/796136/67560465-9d827780-f723-11e9-91ac-9b2fafb027f2.png" height="135px" alt="Spiral Framework" align="left"/>
+# Rapid Admin Panel Application Skeleton [![Latest Stable Version](https://poser.pugx.org/spiral/app-keeper/version)](https://packagist.org/packages/spiral/app-keeper)
 
 Spiral Framework is a High-Performance PHP/Go Full-Stack framework and group of over sixty PSR-compatible components. The Framework execution model based on a hybrid runtime where some services (GRPC, Queue, WebSockets, etc.) handled by Application Server [RoadRunner](https://github.com/spiral/roadrunner) and the PHP code of your application stays in memory permanently (anti-memory leak tools included).